Interest in several regions of the electromagnetic spectrum has increased greatly since the War under the stimulation of new apparatus for the generation and detection of radiation. Just as the perfection of the magnetron and the klystron has given the spectroscopist relatively powerful sources of radiation in well defined frequency ranges of the microwave region, so the invention of the lead sulfide photoconductive cell has provided him with a detector for the near-infrared which is considerably superior in most respects to those he had known heretofore.
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Lauer et al. (1952) studied this question.